hollo vs screech

hollo and screech both are nouns.

Word	Noun	Adjective	Verb	Adverb
hollo	Yes	No	Yes	No
screech	Yes	No	Yes	No

As verbs, screech is a hyponym of hollo; that is, screech is a word with a more specific, narrower meaning than hollo:

hollo (noun)	screech (noun)
a very loud utterance (like the sound of an animal)	sharp piercing cry
	a high-pitched noise resembling a human cry

hollo (verb)	screech (verb)
utter a sudden loud cry	utter a harsh abrupt scream
cry hollo	make a high-pitched, screeching noise
encourage somebody by crying hollo